Re: NFS4 clients cannot reclaim locks

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On Tue, 5 Oct 2010, Timo Aaltonen wrote:

On Fri, 1 Oct 2010, Sachin Prabhu wrote:

NFS4 clients appear to have problems reclaiming locks after a server reboot. I can recreate the issue on 2.6.34.7-56.fc13.x86_64 on a Fedora system.

The problem appears to happen in cases where after a reboot, a WRITE call is made just before the RENEW call. In that case, the NFS4ERR_STALE_STATEID is returned for the WRITE call which results in NFS_STATE_RECLAIM_REBOOT being set in the state flags. However the NFS4ERR_STALE_CLIENTID returned for the subsequent RENEW call is handled by
nfs4_recovery_handle_error() -> nfs4_state_end_reclaim_reboot(clp);
which ends up setting the state flag to NFS_STATE_RECLAIM_NOGRACE and clearing the NFS_STATE_RECLAIM_REBOOT in nfs4_state_mark_reclaim_nograce().

The process of reclaiming the locks then seem to hit another roadblock in nfs4_open_expired() where it fails to open the file and reset the state. It ends up calling nfs4_reclaim_locks() in a loop with the old stateid in nfs4_reclaim_open_state().

By commenting out the call to nfs4_state_end_reclaim_reboot(clp) in nfs4_recovery_handle_error(), the client was able to handle this particular scenario properly.

Has any one else seen this issue?

could this be related to the bug I was seeing with nfsv4 (now using v3 with success):

https://bugzilla.kernel.org/show_bug.cgi?id=15973

though the error returned by the server is BAD_STATEID..

At least testing .37rc2 has so far been positive, suggesting that the bug is fixed there.


--
Timo Aaltonen
Systems Specialist, Aalto IT
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